1. Cytotaxonomic studies in the genus Sonchus;Boulos;Bot. Not.,1960
2. Endemic flora of the Canary Islands; Distribution, relation ships and phytogeography;Bramwell,1976
3. Wild Flowers of the Canary Islands;Bramwell,1974
4. Floristic connections between Macaronesia and the East Mediterranean Region;Bramwell;Monographiae Biologicae Canariensis,1973
5. Beiträge zur Ökologie und Biologie der Kanarenpflanzen;Burchard;Bibl. Bot.,1929